PREFORM FOR PRODUCING PLASTIC CONTAINERS IN A STRETCH BLOW MOULDING PROCESS AND METHOD FOR PRODUCING THE PREFORM

摘要

A method for producing a preform and a preform produced by extrusion blow moulding for producing plastic containers in a stretch blow moulding process and having a neck portion and a body portion closed by a preform base, which portions are separated from each other by a supporting ring protruding from the outer wall. The preform has a body portion of which the outside diameter narrows from the supporting ring in the direction of the preform base.